This article is designed to be used as a guide to assist you with the maintenance and repair of your trailer and towing vehicles socket and plug wiring. If in doubt ask a specialist to inspect the trailer or towing vehicle.

Pin 1 – Yellow – Left-hand turn indicator Pin 2 – Black – Reversing signal Pin 3 – White – Earth return Pin 4 – Green – Right-hand turn indicator Pin 5 – Blue – Service brakes Pin 6 – Red – Stop lamps Pin 7 – Brown – Rear lamps, clearance and side marker lamps

Pin 1 – Yellow – Left-hand turn indicator Pin 2 – Black – Reversing signal Pin 3 – White – Earth return Pin 4 – Green – Right-hand turn indicator Pin 5 – Blue – Service brakes Pin 6 – Red – Stop lamps Pin 7 – Brown – Rear lamps, clearance and side marker lamps